题目内容
计算
(1)
-(
-
)
(2)(4
-4
+3
)÷2
(3)(
-1)2+(
-
)(
+
).
(1)
| 18 |
| 98 |
| 27 |
(2)(4
| 6 |
|
| 8 |
| 2 |
(3)(
| 3 |
| 3 |
| 2 |
| 3 |
| 2 |
(1)原式=3
-7
+3
=-4
+3
,
(2)原式=(4
-2
+6
)÷2
,
=4
÷
-2
÷2
+6
÷2
,
=4
-1+3,
=4
+2,
(3)原式=(3+1-2
)+(3-2),
=4-2
+1,
=5-2
,
| 2 |
| 2 |
| 3 |
| 2 |
| 3 |
(2)原式=(4
| 6 |
| 2 |
| 2 |
| 2 |
=4
| 6 |
| 2 |
| 2 |
| 2 |
| 2 |
| 2 |
=4
| 3 |
=4
| 3 |
(3)原式=(3+1-2
| 3 |
=4-2
| 3 |
=5-2
| 3 |
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